trace_hardirqs_on_virt[_caller]() must be invoked instead of
trace_hardirqs_on[_caller]() from assembly sites before returning from
an interrupt/fault, so that the virtual IRQ disable state is checked
for before switching the tracer's logic state to ON.

This is required as an interrupt may be received and handled by the
pipeline core although not forwarded to the root domain, when
interrupts are virtually disabled. In such a case, we want to
reconcile the tracer's logic with the effect of interrupt pipelining.